{"id":"F2006B04815","name":"AD/BUSHBY M2/1 - Canopy Frame - Modification","slug":"ad-bushby-m2-1-canopy-frame-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44613,"registerId":"commonwealth-F2006B04815-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BUSHBY M2/1 - Canopy Frame - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Bushby Mustang II Series Aeroplanes\n\n \n\nAD/BUSHBY M2/1 Canopy Frame - Modification 2/85\n\nApplicability: All Models.\n\n \n\nRequirement: Reinforce the canopy framework at the aft corners and manufacture and install an aft retaining pin and bracket I.A.W. Mustang II Canopy Frame Revision Instruction dated 11.1.84.\n\n \n\nNote: Copies of Bushby Mustang II, Canopy Frame Revision dated 11.1.84 may be obtained from D of A Regional Offices.\n\n \n\nCompliance: Modify prior to 31 August 1985.\n\n \n\nBackground: As a result of a fatal accident in which the canopy detached in flight, canopy reinforcement and improved latching is warranted.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1584},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope. It was issued specifically to address the canopy detachment risk identified after a fatal accident, and remains focused solely on requiring physical modifications to canopy frames on Bushby Mustang II aircraft."},"complexity_factors":["Single, discrete technical requirement (two-part physical modification)","Relies entirely on external technical document for specifications rather than detailing them in the legislative text","No conditional exemptions, exceptions, or cross-references to other regulatory provisions","Clear applicability limited to one specific aircraft series"],"plain_english_summary":"This airworthiness directive mandates a safety fix for **Bushby Mustang II aircraft** to prevent the cockpit canopy from detaching in flight.\n\n**What must be done:**\n- Reinforce the canopy framework at the rear (aft) corners\n- Manufacture and install a new retaining pin and bracket at the rear of the canopy\n\n**Why it matters:**\nFollowing a fatal accident where a canopy detached mid-flight, these modifications are required to ensure the canopy stays securely latched and structurally sound.\n\n**How to comply:**\nOwners must carry out the work according to the technical specifications in the *Mustang II Canopy Frame Revision Instruction* dated 11 January 1984 (available from Department of Aviation Regional Offices). The modification had to be completed before **31 August 1985**.\n\nThis applies to all models of the Bushby Mustang II series."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bushby-m2-1-canopy-frame-modification","history":"/api/acts/ad-bushby-m2-1-canopy-frame-modification/history","analysis":"/api/acts/ad-bushby-m2-1-canopy-frame-modification/analysis","conflicts":"/api/acts/ad-bushby-m2-1-canopy-frame-modification/conflicts","importantCases":"/api/acts/ad-bushby-m2-1-canopy-frame-modification/important-cases","documents":"/api/acts/ad-bushby-m2-1-canopy-frame-modification/documents"}}